Analysis Of Crab Pulsar X-ray Timing Observation Data

At present,the research on pulsar navigation and pulsar time scale has become a hot research direction in China and the world astronomy.In order to realize the practical application of pulsar navigation at an early date,in addition to theoretical exploration and long-term ground observation,China has launched several satellites that could be used for pulsar timing and pulsar navigation experiments in recent years which obtained a large amount of data.By analyzing and processing the pulsar observation data obtained by the satellites,the timing accuracy could be evaluated,which provides a reference for the deeper space-based pulsar timing and navigation test in the future.In view of this,this paper clarified the relationship between X-ray pulsar timing and pulsar navigation.The navigation accuracy was indirectly tested by the timing analysis of the pre-released data of the pulsar navigation test satellite(XPNAV-1).Compared with the results of the predecessors,this thesis not only improved the accuracy of the timing residual by an order of magnitude,but also analyzed several factors that may affect the timing accuracy.At the same time,the observed photon data was grouped and the effect of photon energy on the timing accuracy of the satellite was discussed in depth.In addition to improving the timing accuracy,the above results can also verify the satellite observation data is in line with theoretical expectation.Meanwhile,the conclusions and problems encountered in the analysis could be used as reference for future pulsar navigation experiments in China.Firstly,this paper introduced the background and flow of pulsar timing and pulsar navigation,and reviewed its development process and current situation,and demonstrated the necessity of timing analysis of X-ray pulsar observation data.At the same time,the principle and method of X-ray pulsar timing were described in detail.Subsequently,this thesis processed the 35 sets of observation data of Crab pulsars released by XPNAV-1.After obtaining the integrated pulse profile of each observation of the XPNAV-1 satellite,a standard pulse profile was obtained.Using the Crab pulsar ephemeris released by Jordrell Bank Observatory and the solar system ephemeris released by JPL,the pre-fit time residual and its measurement accuracy,?TOA were further obtained.The system trend term does not exist.This thesis also made a preliminary investigation on the factors affecting the timing residual and its measurement accuracy.After obtaining the timing residual of all the photons of the data and its measurement accuracy,the data was grouped according to the photon number ratio and the photon energy.The above process was repeated,and the corresponding integrated pulse profile and standard pulse profile were obtained respectively,and finally the pre-fit time residual and ?TOA of each group of photon observations are obtained.By comparing standard pulse profile shape characteristics,timing residuals,and ?TOA of each group,the influence of photon energy on the timing accuracy of pulsars was analyzed.Finally,based on the above analysis results,this paper proposed improvement measures for the future observation scheme of XPNAV-1 satellite.At the same time,the problems that have yet to be solved were summarized,in order to provide useful reference for the subsequent experiments of pulsar timing and navigation in China.